With Samsung (and ALL of the other manufacturers) they have never had a backdoor on any of the phones since Android 6 (maybe even 5). There WAS a reset on some which used your Google account, but it's been unsupported for years at this point. All of these backdoors died the moment the FBI picked a fight with Apple (and lost). The option we once had in Android (with spotty support) is DEAD, and WILL NEVER come back.... Even Google also sided with Apple. They set the precedent that this kind of case is permissible in court if it has a way in, so having anything on the phone is too dangerous now. The issue is the All Writs Act is overreaching. The logic with dropping it is if you can't get in and the user controls the encryption, you cannot help a 3 letter agency if it is technically impossible (at least in the US). Even if we found a way to make the FBI try harder to pull the same stunt, I will not support such a thing now that the FBI made their intentions clear out of principle. Killing one overreaching law means they go in the books to find a new one to abuse. Everyone took such a hard stance on this in general new Android phones are almost certainly encrypted during the OOBE setup... PERMANENTLY. My last (and final) phone with reversible encryption which could be decrypted with a button (but not bypassed) was the LG G4.
That said, it may still be possible with 3rd party SW on a non-encrypted phone, providing the phone does not have an inaccessible encrypted private key, use the passcode to encrypt it or both. A lot of these new phones are designed to intentionally keep the FBI and 3 letter agencies out now. This is why Apple won; they locked themselves out of the phone and had a successful defense and it can be used as a defense by any OEM.
Yes, I absolutely do feel bad about how it affects people like you, but I'm firmly against adding these backdoors back to phones since there will now be legal leverage even though the FBI got shut down... THEY WILL try again if the door is open. The remote possibility is too dangerous now! The Apple vs. FBI case was the reason I permanently retired my iPhone 4, and non-iOS 8 capable devices. If it lacks a secure enclave, I do not use it for sensitive data since the FBI has learned a few tricks to crack these legacy devices. While you are absolutely screwed now with secure enclaves and non-reversible encryption being the norm, it's for the best for everyone :(.